Rapid measurements of neptunium oxidation states using chromatographic resins

The Savannah River Site’s (SRS) H-Canyon facility uses ceric ammonium nitrate (CAN) to separate impure neptunium (Np) from a nitric acid feed stream containing 0.5–1.0 M concentrations of iron, sodium and sulfate impurities. The material is processed using a two-pass solvent extraction purification...

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Bibliographic Details
Published in:Journal of radioanalytical and nuclear chemistry 2009-11, Vol.282 (2), p.581-584
Main Authors: DiPrete, David P., DiPrete, Cecilia C., Kyser, Edward A., Malek, Mira A.
Format: Article
Language:English
Subjects:
Chemistry
Chemistry and Materials Science
Chromatography
Diagnostic Radiology
Hadrons
Heavy Ions
Inorganic Chemistry
Neptunium
Nuclear Chemistry
Nuclear Physics
Oxidation
Physical Chemistry
Polymers
Resins
Sodium
Solvent extraction
Streams
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Summary:The Savannah River Site’s (SRS) H-Canyon facility uses ceric ammonium nitrate (CAN) to separate impure neptunium (Np) from a nitric acid feed stream containing 0.5–1.0 M concentrations of iron, sodium and sulfate impurities. The material is processed using a two-pass solvent extraction purification which relies on CAN to oxidize Np to Np(VI) during the first pass prior to extraction. Spectrophotometric oxidation-state analyses normally used to validate successful oxidation to Np(VI) prior to extraction were compromised by this feed stream matrix. Therefore, a rapid chromatographic method to validate successful Np oxidation was developed using Eichrom Industries’ TRU and TEVA ® resins. The method was validated and subsequently transferred to existing operations in the process analytical laboratories.
ISSN:0236-5731
1588-2780
DOI:10.1007/s10967-009-0249-6